TJ Longda 20 Pieces Fuel Injection Hose Clamps FI4 7/16" - 1/2" or 11-13mm 1. Professional grade, meet J1508 Specifications. 2. Non-perforated rolled edge bands with a special nut and bolt tightening design. 3. Band: 9mm wide, zinc plated, clear chromate and carbon steel. 4. Screw:7mm hex-head. zinc plated, clear chromate, carbon steel, corrosion resistant. 5. Common and suitable for OEM coolant, fuel, oil, vacuum, and emission systems